CN201520798U - Smelting equipment system for low-temperature alloy steel for engineering - Google Patents

Abstract

A smelting equipment system for low-temperature alloy steel for engineering comprises a smelting furnace, a temperature monitoring device, a discharge device and a host control unit connected with the smelting furnace, the temperature monitoring device, and the discharge device. The host control unit can control temperature of the smelting furnace and the discharge device so as to achieve the composition and percentage according to obtained temperature signals transmitted by the temperature monitoring device. The smelting equipment system is further provided with a slagging device, a sampling analyzing device and a deoxygenating unit so as to match with operation of the control unit. The smelting equipment system is simple in equipment, reliable in control, low in production cost and low in pollution.

Description

The engineering smelting device system of low-temperature alloy steel

Technical field

The utility model relates to the smelting device system of a kind of engineering with the low-temperature alloy steel, particularly can be used on the winning apparatus of open-air multiplex (MUX) ore deposit, can be suitable for severe environment requirements such as high strength and low temperature, have the smelting device system of the engineering of superelevation hard toughness with the low-temperature alloy steel.

Background technology

Wearing and tearing are many industrial sector ubiquities and become a major reason that causes equipment failure or material damage that it has also consumed a large amount of energy and material simultaneously.The various engineering excavation machines of being made by Alloy Cast Steel and shovel loader bucket tooth, various wear resistant conveying pipes road, various grinder hammerhead and jaw, various grip-pad, owing to be in working conditions such as high strength, atrocious weather, its wear pattern is more serious.

The present state of the art is: the hardness of general material and the performance index that toughness is mutual contradiction, and hardness high poor toughness then normally, toughness height then hardness is low.One class is to emphasize the high tenacity of material, and a class is to emphasize the resistance to abrasion of material.And can't reach an effectively unification, especially in the application that is used on the engineering machinery such as outdoor mining, excavation.The wear resistance of high mangaenese steel is with good conditionsi, and its yield strength is low, easily deformable; Low, interalloy wear resisting steel has better strength and toughness, and the wear resistance under low, the middle shock load is better than high mangaenese steel, but has hardening capacity and the low problem of hardenability, and wear resistance is relatively poor; Contain in the rich chromium cast iron tissue and surpass 20% high rigidity eutectic carbides, have excellent abrasive, have the yielding rimose deficiency of alloying element content height, production cost height and high melt; Ordinary white cast iron and low-alloy chilled cast iron carbide hardness are low, and carbide is continuous shape and distributes, and fragility is big, easily peel off in the use even ftracture.

At present situation, obtain that a kind of production technique is simple, cost is low, obdurability is high, hardening capacity and hardenability be good and pollution-free, guarantee the works fine in low temperature environment simultaneously, and the wear-resistant alloy cast steel that also can well use under the condition of multiplex (MUX) ore deposit has become a technical problem.People recognize that also it is one of effective measure that improves iron and steel liquid quality that Modification Treatment Technique is bred in the stokehold simultaneously, and it can remedy the deficiency in the fusion process to a certain extent; Melting, refining and filtering technique are the production gordian techniquies of wear-resistant metal material, and can above-mentioned two technology for realizing that this project coupling rationalization scheme is most important.Therefore the melting technology that provides a kind of new alloying constituent with wear-resistant alloy cast steel to adapt will be the important manufacturing technology link that guarantees the alloying constituent of wear-resistant alloy cast steel and then guarantee its mechanical property.And, also should be equipped with corresponding automatic equipment, to realize above-mentioned melting technology as the automatization requirement of modern enterprise.

The utility model content

For solving the problems of the technologies described above, the utility model provides a kind of smelting device system that is suitable for mutually with New-type wear-resistant alloy cast steel: the chemical ingredients of wherein said New-type wear-resistant alloy cast steel and mass percent thereof are: C:0.27-0.32; Mn:0.70-0.90; Si:0.90-1.30; Cr:1.40-1.80; Mo:0.10-0.20; Ni:0.10-0.20; Ti:0.02-0.03; Described smelting device system comprises:

Smelting furnace places in the stove to monitor the device for monitoring temperature of temperature in the described smelting furnace; Can in described smelting furnace, throw in the blanking device of material; Wireless with said apparatus or wired upper control unit that links to each other, described upper control unit can be made control to the temperature of smelting furnace and the work of blanking device according to the temperature signal of the device for monitoring temperature transmission that is obtained; Wireless with upper control unit or wired that link to each other and be provided with the slag making device of flux, in described smelting furnace, drop into described flux and carry out slag making to control it, be provided with flux and can be at described blanking device addition element respectively in the described slag making device: behind carbon, molybdenum-iron, ferrochrome, nickel, the ferrotianium, or drop into described flux slag making cutting off the power supply in the described smelting furnace of molten steel cast forward direction; Wireless with upper control unit or wired sampling analysis device that links to each other, to control it alloying element in stove is carried out sampling analysis and exports the result to upper control unit, described control unit is controlled described blanking device according to described analytical results and is packed respective element into until the described composition range that reaches respective element; Wireless with upper control unit or wired device for deoxidizing that links to each other, with the controlled reductor that in smelting furnace, adds to reduce the air content in the molten steel as far as possible, described reductor is the aluminium of 0.03-0.06%, and described device for deoxidizing drops into described reductor after described blanking device drops into ferromanganese.

Simple through production technique provided by the utility model, cost is low, polluting little smelting device system can be effectively, high-quality obtains described wear-resistant alloy cast steel, its tensile strength: 1500-1800MPa, yield strength: 1200-1400MPa, unit elongation: δ s7-15%, v-notch impelling strength Akv25-40J, hardness: 48-55HRC.And be suitable in low temperature environment, as-20 ℃～0 ℃, and freeze the wear-resistant engineering machinery equipment that rock, frozen soil layer contact, adapt to requirement in the medium-term and long-term work of cold belt environment.

Description of drawings

Fig. 1 is the synoptic diagram of this melting equipment.

Embodiment

Specify the utility model below in conjunction with Fig. 1, the utility model provides a kind of smelting device system that is suitable for mutually with New-type wear-resistant alloy cast steel, and the chemical ingredients of its described cast steel and mass percent thereof are: C:0.27-0.32; Mn:0.70-0.90; Si:0.90-1.30; Cr:1.40-1.80; Mo:0.10-0.20; Ni:0.10-0.20; Ti:0.02-0.03.Wherein the major function that each alloy had is:

Carbon (C): carbon content is high more, and the intensity of steel and hardness value increase, and plasticity and toughness value reduce;

Silicon (Si): reinforced ferrite, improve tensile strength and yield strength, improve thermotolerance and solidity to corrosion, reduce toughness and plasticity;

Manganese (Mn): improve intensity, hardness and wear resistance;

Chromium (Cr): reduce the thermal conductivity of steel, can improve wear resistance;

Molybdenum (Mo): reinforced ferrite, improve high-temperature behavior, improve fragility;

Nickel (Ni): enlarging the austenitic area, is the effective element of austenitizing, improves intensity and does not significantly reduce plasticity, and good corrosion resistance is arranged;

Ferrotianium (Ti): can reinforced ferrite, deoxidation and crystal grain thinning.

For obtaining above-mentioned wear-resistant alloy cast steel, it is one its corresponding that the utility model provides, and have that production technique is simple, cost is low, pollute the smelting device system of little characteristics, it specifically comprises: smelting furnace 1, place the device for monitoring temperature 2 to monitor temperature in the described smelting furnace in the stove, can in described smelting furnace, throw in the blanking device 3 of material, and the upper control unit 8 that links to each other with said apparatus.

Simultaneously preferred, can also have and upper control unit slag making device 4 that link to each other and that be provided with flux, with the controlled flux that in described smelting furnace 1, adds with the formation slag; The sampling analysis device 5 that links to each other with upper control unit transmits data results with the controlled sampling analysis that molten steel in the smelting furnace 1 is analyzed and to control unit; The device for deoxidizing 6 that links to each other with upper control unit in addition, with the controlled reductor that in smelting furnace 1, adds to reduce the air content in the molten steel as far as possible.

Smelting furnace 1 preferred embodiment is to adopt tart high frequency or medium-frequency induction furnace to carry out melting, and determines pre-loading amount according to the amount of capacity of stove 1.When melting, at first in stove 1, sprinkle one deck flux (about the about 10mm of thickness) by upper control unit 8 control slag making devices 4 on the bottom, feed again according to the amount of capacity of stove simultaneously, should pack into earlier and can send electrofusion behind the part small powder, fusing along with furnace charge, the furnace charge that should pack into successively and be unkitted, for preventing " bridge formation " (promptly blocking) phenomenon, should accomplish " tight down upward pine ", and in fusion process, should in time disclose material, so that the fusing of furnace charge, and in time sprinkle flux by upper control unit 8 control slag making devices 4 and carry out slag making, the flux consumption is as the criterion to cover whole bath surface.

In the utility model preferred embodiment, described upper control unit 8 can be made following control to the temperature of smelting furnace 1 and the work of blanking device 3 according to the temperature signal of device for monitoring temperature 2 transmission that obtained:

When the melting molten steel is warming up to 1550-1560 ℃ in described device for monitoring temperature 2 monitors described smelting furnace 1, described blanking device 3 is addition element respectively: carbon, molybdenum-iron, ferrochrome, nickel, ferrotianium, it is stirred the back cover upward flux slag making, continue then to heat up by blanking device 3;

When the melting molten steel was warming up to 1570-1580 ℃ in described device for monitoring temperature 2 monitors described smelting furnace 1, described blanking device 3 added ferrosilicon;

Control sampling analysis device 5 then and carry out the stokehold sampling analysis, analytical instrument can preferably adopt spectrograph, to the stokehold Chemical Composition that upper control unit transmitted, described control unit is controlled described blanking device 3 and is replenished respective element again according to sampling analysis device 5;

When the melting molten steel was warming up to 1590-1600 ℃ in described device for monitoring temperature 2 monitors described smelting furnace 1, described blanking device 3 added ferromanganese;

6 deoxidations of upper then control unit control device for deoxidizing are to reduce the air content of molten steel as far as possible, and deoxidation is aluminium preferably, and its ratio is 0.03-0.06%, and in time control slag making device 4 and sprinkle the flux slag making; Control sampling analysis device 5 then and carry out sampling analysis behind the stove, and in conjunction with control blanking device 3 till reaching the composition claimed range;

When the melting molten steel was warming up to 1610-1630 ℃ in described device for monitoring temperature 2 monitors described smelting furnace 1, described smelting furnace 1 outage was skimmed and is gone out the molten steel cast.

According to introducing in the preferred embodiment; owing to adopt acid lined furnace to carry out melting; simultaneously by control unit according to the temperature corresponding adding different-alloy element of device for monitoring temperature with certain molten steel; therefore it is minimum to make that the scaling loss of valuable important alloying element drops to, and for example the effective constituent of the last ferromanganese that adds just obtains maximum protection.This makes that not only whole fusion process production technique is simple, it is little to pollute, and production cost has also obtained effective control simultaneously.In addition, as the further improvement of technology, by carry out the flux slag making between appropriate step, discharged the impurity in the liquation, the precision of melting product and accepted product percentage are reliable more and be improved; Added stokehold sampling analysis (can also carry out sampling analysis in the stove) again, made technological process compact more, production efficiency and process are more reliable, the plant factor height.

Through the resulting described wear-resistant alloy cast steel of this smelting device system, its tensile strength: 1500-1800MPa, yield strength: 1200-1400MPa, unit elongation: δ s7-15%, v-notch impelling strength Akv25-40J, hardness: 48-55HRC.Alloy Cast Steel and smelting device system thereof in the utility model have: production technique is simple, cost is low, obdurability is high, hardening capacity and hardenability is good and free of contamination characteristics.Resulting Alloy Cast Steel is suitable in low temperature environment, as-20 ℃～0 ℃, and freezes the wear-resistant engineering machinery equipment that rock, frozen soil layer contact, and adapts to the requirement in the medium-term and long-term work of cold belt environment.

The embodiment that is disclosed in the utility model will obtain embodying and protection by claim, and will be any according to resulting enlightenment in the utility model, all fall among the scope that the utility model protects.

Claims (2)

1. the smelting device system of an engineering usefulness low-temperature alloy steel is characterized in that, comprising:

Smelting furnace places in the stove to monitor the device for monitoring temperature of temperature in the described smelting furnace;

Can in described smelting furnace, throw in the blanking device of material;

Wireless with said apparatus or wired upper control unit that links to each other, described upper control unit can be made control to the temperature of smelting furnace and the work of blanking device according to the temperature signal of the device for monitoring temperature transmission that is obtained;

Wireless with upper control unit or wired that link to each other and be provided with the slag making device of flux, in described smelting furnace, drop into described flux and carry out slag making to control it, be provided with flux and can be at described blanking device addition element respectively in the described slag making device: behind carbon, molybdenum-iron, ferrochrome, nickel, the ferrotianium, or drop into described flux slag making cutting off the power supply in the described smelting furnace of molten steel cast forward direction;

Wireless with upper control unit or wired sampling analysis device that links to each other, to control it alloying element in stove is carried out sampling analysis and exports the result to upper control unit, described control unit is controlled described blanking device according to described analytical results and is packed respective element into until the described composition range that reaches respective element;

Wireless with upper control unit or wired device for deoxidizing that links to each other, with the controlled reductor that in smelting furnace, adds to reduce the air content in the molten steel as far as possible, described reductor is the aluminium of 0.03-0.06%, and described device for deoxidizing drops into described reductor after described blanking device drops into ferromanganese.

2. the engineering according to claim 1 smelting device system of low-temperature alloy steel, it is characterized in that: described smelting furnace is tart high frequency or medium-frequency induction furnace.

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